. Quarterly journal of experimental physiology and cognate medical sciences. dquickly into an area focal for movements of the abdominal wall. Abdominal Wall.—Movements of the contralateral abdominal wall arevery regularly elicitable from a small area situate at the genu superiuslevel. The area merges in chest-wall area below and hip area above. Themovements are, in our experience, always unilateral and of the area commonly lies buried in sulcus centralis, and in the spur The Excitable Cortex of the Chimpanzee, Orang-Utan, and fJt^rilla 175 fissure when that is present. Over
. Quarterly journal of experimental physiology and cognate medical sciences. dquickly into an area focal for movements of the abdominal wall. Abdominal Wall.—Movements of the contralateral abdominal wall arevery regularly elicitable from a small area situate at the genu superiuslevel. The area merges in chest-wall area below and hip area above. Themovements are, in our experience, always unilateral and of the area commonly lies buried in sulcus centralis, and in the spur The Excitable Cortex of the Chimpanzee, Orang-Utan, and fJt^rilla 175 fissure when that is present. Over the area one or more large veinsconiiMonly traverse the face of the convolution (fig. IS), rendering theexperimental examination of the area somewhat difficult. From theabdominal wall area anal movement is sometimes elicitable secondary tomovements of the abdominal wall. 5. Lejj Area. Leg Area.—The movements of the several parts of the limb seem morecommingled in this area than are those of the separate limb parts in the ^>(vjkA\ ^vV / ,J\x\Wc .^ >A<« \oi Fig. 18. —The veins passing over trunk area of motor cortex in a large chimpanzee ;drawn by Professor Harvey Gushing. arm area. Nevertheless a general sequence of foci of main representationis recognisable; as the area is examined from below upwards this sequenceruns hip, knee, ankle, and digits. The leg area extends over the mesialborder of the hemisphere, and dips into the mesial surface for about one-third of the depth toward corpus callosum (figs. 2, 7 B, 9, 10, 13, 14, 15, 17,24). The area does not usually follow sulcus centralis to the extreme endof the sulcus, but leaves it a few millimeti-es below that, and slants obliquelyforward over the mesial edge of the hemisphere. Hip.—The movements have a wide focal field; in our experience, thelowest situate of the movements is flexion. On the whole, extension of hiplies farther anterior than does flexion. In some specimens, notably in oneorang, extension
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